h8s-2628 Renesas Electronics Corporation., h8s-2628 Datasheet - Page 519

• Manufacturer Part Number: h8s-2628
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

9. All interrupts are disabled during programming or erasing of the flash memory.
Table 19.4 Boot Mode Operation
Table 19.5 System Clock Frequencies for which Automatic Adjustment of LSI Bit Rate is
Host Bit Rate
19,200 bps
9,600 bps
4,800 bps
Item
Boot mode
start
Bit rate
adjustment
Transfer of
programming
control
program
Flash memory
erase
Host Operation
Processing Contents
Transmits data H'55 when data H'00
is received error-free
Transmits number of bytes (N) of
programming control program to be
transferred as 2-byte data (low-order
byte following high-order byte)
Continuously transmits data H'00 at
specified bit rate
Receives data H'AA
Transmits 1-byte of programming
control program (repeated for
N times)
Receives data H'AA
Possible
Boot program
erase error
System Clock Frequency Range of LSI
24 MHz
24 to 8 MHz
24 to 4 MHz
Communications Contents
H'00, H'00 ...... H'00
High-order byte and
low-order byte
Echoback
Echoback
H'AA
H'XX
H'00
H'55
H'AA
H'FF
Rev. 3.00 Oct 04, 2005 page 479 of 598
LSI Operation
Processing Contents
Branches to boot program at reset-start
· Measures low-level period of receive data
· Calculates bit rate and sets it in BRR of
· Transmits data H'00 to host as adjustment
H'00
SCI_2
end indication
Transmits data H'AA to host when data
Echobacks the 2-byte data received
Echobacks received data to host and also
transfers it to RAM (repeated for N times)
Checks flash memory data, erases all
flash memory blocks in case of written
data existing, and transmits data H'AA to
host (If erase could not be done,
transmits data H'FF to host and aborts
operation)
Branches to programming control program
transferred to on-chip RAM and starts
execution
H'55 is received
Boot program initiation
REJ09B0155-0300
Section 19 ROM